#!/usr/bin/env python

###############################################################################
# Copyright 2017 The Apollo Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
###############################################################################


class ChassisProvider:
    def __init__(self):
        self.chassis_pb = None

    def update(self, chassis_pb):
        self.chassis_pb = chassis_pb

    def get_speed_mps(self):
        if self.chassis_pb is None:
            return None
        return self.chassis_pb.speed_mps
